package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Slf4j
@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Transactional //0.开启事务（涉及到多张表的增删改查操作需要开事务）
    public void addDish(DishDTO dto) {
        //1.构造菜品基本信息数据，将其存入dish表
        Dish dish = new Dish();
        //拷贝属性值
        BeanUtils.copyProperties(dto, dish);
        //调用mapper保存方法
        dishMapper.insert(dish);

        //2.构造菜品口味列表数据，将其存入dish_flavor表中
        List<DishFlavor> dishFlavors = dto.getFlavors();
         //2.1关联菜品id
        dishFlavors.forEach(df -> {
            df.setDishId(dish.getId());
        });
         //2.2 调用mapper保存方法,批量插入口味列表数据
        dishFlavorMapper.insertBath(dishFlavors);

    }



    @Override
    public PageResult page(DishPageQueryDTO dto) {
        //1.设置分页参数
        PageHelper.startPage(dto.getPage(),dto.getPageSize());

        //2.调用mapper的列表查询方法，强转Page
         Page<DishVO> page = dishMapper.list(dto);

        //3.封装PageResult对象并返回
        return new PageResult(page.getTotal(),page.getResult());
    }



    @Transactional  //0.开启事务
    public void delete(List<Long> ids) {
    //1.删除菜品前，需要判断菜品是否启售，启售中不允许删除
      ids.forEach(id -> {
          Dish dish = dishMapper.selectById(id);
          if(dish.getStatus() == StatusConstant.ENABLE){
              throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
          }

      });
    //2.需要判断菜品是否被套餐关联，关联了也不允许删除
        Integer count = setmealDishMapper.countByDishId(ids);
        if(count > 0){
            throw  new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

    //3.删除菜品基本信息dish表
        dishMapper.deleteBath(ids);

    //4.删除菜品口味列表信息 dish_flavor 表
        dishFlavorMapper.deleteBath(ids);
    }


   /*
   * 回显菜品
   * */
    @Override
    public DishVO getById(Long id) {
        DishVO dishVO = new DishVO();

        //1.根据菜品id查询菜品基本信息,封装到dishVo中
        Dish dish = dishMapper.selectById(id);
        BeanUtils.copyProperties(dish, dishVO);

        //2.根据菜品id查询口味列表数据,封装到dishVo中

        List<DishFlavor> dishFlavors = dishFlavorMapper.selectByDishId(id);
        dishVO.setFlavors(dishFlavors);

        //3.构造DishVo对象并返回
        return  dishVO;
    }

    /**
     * 修改菜品
     * @param dto
     */
    @Transactional
    public void update(DishDTO dto) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dto, dish);

        //1.修改菜品的基本信息，dish表
        dishMapper.updata(dish);

        //2.修改口味列表信息，dish_flavor表
        //由于口味数据肯能增加，可能删除，还可能修改口味的值，涉及到增删改操作，所以先全部删除旧数据，再添加新数据
        dishFlavorMapper.deleteByDishId(dto.getId());

        List<DishFlavor> flavors = dto.getFlavors();
        if(flavors != null && flavors.size() > 0){
            //关联菜品id
            flavors.forEach(df -> {
                df.setDishId(dish.getId());
            });
            dishFlavorMapper.insertBath(flavors);
        }


    }
}
